Research progress of protease inhibitor Cystatin SN / 中国医师杂志

Cysteine protease inhibitor SN (CST1) is one of the members of type 2 Cystatin superfamily. It is widely expressed and distributed in mammals. It contains many types of CST proteins and is located on chromosome 20p11.2. Cystatin SN has a variety of biological functions and is involved in the occurrence and development of tumor genesis and metastasis, inflammation, cell cycle and aging.